<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="/js/vue.js"></script>
</head>
<body>
    <div id="app">
        <input type="text" v-model="msg">
        {{msg\upperCase\asterisk}}
    </div>
    <script>
        Vue.filter('upperCase',function(val){
            return val.toUpperCase();
        })
        Vue.filter('asterisk',function(val){
            var reg = d/g;
            return val.replace(reg,'**');
        })
        var app = Vue({
            el:'#app',
            data:{
                msg:''
            },
        });
    </script>
    
</body>
</html>